I don't have the gobble stopper....I have the strut stopper xtreme which is the next model up from the gobble stopper. I like it and it patterns very nicely out of my Rem 870 SPS-T. Very nice choke tube for $35.
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Remington Model 11-87 Premier 12 Gauge
Remington Model 870 SPS-T Camo Thumbhole 12 Gauge
Ruger M77 Mark II .270 w/ Nikon 3-9x40 Buckmasters